Fix history deletion bug after font change

The history is no longer cleared after the font size is changed

src/qt/rpcconsole.cpp

@@ -490,16 +490,19 @@ void RPCConsole::setFontSize(int newSize)
 
     // clear console (reset icon sizes, default stylesheet) and re-add the content
     float oldPosFactor = 1.0 / ui->messagesWidget->verticalScrollBar()->maximum() * ui->messagesWidget->verticalScrollBar()->value();
-    clear();
+    clear(false);
     ui->messagesWidget->setHtml(str);
     ui->messagesWidget->verticalScrollBar()->setValue(oldPosFactor * ui->messagesWidget->verticalScrollBar()->maximum());
 }
 
-void RPCConsole::clear()
+void RPCConsole::clear(bool clearHistory)
 {
     ui->messagesWidget->clear();
+    if(clearHistory)
+    {
         history.clear();
         historyPtr = 0;
+    }
     ui->lineEdit->clear();
     ui->lineEdit->setFocus();
 

src/qt/rpcconsole.h

@@ -77,7 +77,7 @@ private Q_SLOTS:
     void clearSelectedNode();
 
 public Q_SLOTS:
-    void clear();
+    void clear(bool clearHistory = true);
     void fontBigger();
     void fontSmaller();
     void setFontSize(int newSize);